This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, etc. of industrial caprolactam. This standard applies to industrial caprolactam prepared from cyclohexanone as raw material. This product is used in synthetic fiber, engineering plastics and other industries. GB 13254-1991 Industrial caprolactam GB13254-1991 standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of Chinawww.bzxz.net
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Caprolactam for industrial use1 Subject content and scope of application
GB13254-91
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, etc. of industrial caprolactam. This standard applies to industrial caprolactam produced from cyclohexanone. This product is mainly used in synthetic fiber, engineering plastics and other industries. Molecular formula C.HNO
Structural formula
CH,—CH,—CH,—CH,—CH,
-NH-
Relative molecular mass 113.16 (according to 1987 International relative atomic mass) 2 reference standards
GB1250
GB8170
GB8947
Expression method and judgment method of limit values ??Numerical rounding rules
Composite plastics Woven bags
GB/T13255.1 Industrial caprolactam
GB/T13255.2 Industrial caprolactam
Determination of colorimetry of 50% aqueous solution Determination of crystallization point by spectrophotometry||tt ||Determination of absorption value of potassium permanganate Spectrophotometric method GB/T13255.3 Industrial caprolactam
GB/T13255.4 Industrial caprolactam
Determination of volatile alkali content Titration after distillation Method Determination of absorbance at 290nm wavelength
GB/T13255.5 Industrial caprolactam
GB/T13255.6
GB/T13255.7
GB/T13255. 8
3 Technical requirements
Industrial caprolactam
Industrial caprolactam
Industrial caprolactam
Determination of acidity or alkalinity||tt ||Determination of iron content
Determination of cyclohexanone content
3.1 Appearance: white flaky solid, no visible impurities. 3.2 The quality of industrial caprolactam should comply with the requirements in Table 1. Table 1
item
item
50% aqueous solution color, Hazen unit—
platinum-diamond color number
crystallization point, ℃||tt ||State Bureau of Technical Supervision approved high-quality products on 1991-11-09
3
68.9
refers to
etc.
5
standard | |tt | tt||Absorption value of potassium permanganate
Item
Volatile base content, mmol/kg
Absorbance at 290nm wavelength
Acidity, mmol/kg||tt ||Alkalinity, mmol/kg
Iron (Fe) content, 10-5
Cyclohexanone content, 10-6
Test method
4|| tt||4. Determination of chromaticity of 150% aqueous solution
item
shall be carried out in accordance with the provisions of GB/T13255.1.
4.2 Determination of crystallization point
shall be carried out in accordance with the provisions of GB/T13255.2.
4.3 Determination of the absorption value of potassium permanganate
shall be carried out in accordance with the provisions of GB/T13255.3.
4.4 Determination of volatile alkali content
According to the regulations of GB/T13255.4.
Determination of absorbance at 4.5290nm wavelength
shall be carried out in accordance with the provisions of GB/T13255.5.
4.6 Determination of acidity or alkalinity
According to the regulations of GB/T13255.6.
4.7 Determination of iron content
According to the regulations of GB/T13255.7.
4.8 Determination of cyclohexanone content
shall be carried out in accordance with the provisions of GB/T13255.8.
5 Inspection Rules
GB13254—91
Continued Table 1
Superior Products
5
0.4
0. 04
0.10
0.10
0.2
20
refers to
standard
other products
10
0.8
0.10
0.20
0.20
0.5
20
Qualified product
20| |tt||1.5
0. 20
1.0
5.1 Industrial caprolactam should be inspected by the quality supervision department of the manufacturer on a batch basis. The manufacturer should ensure that all shipped Lactam meets the requirements of this standard. Each batch of caprolactam shipped from the factory should be accompanied by a quality certificate in a certain format, including the name of the manufacturer, product name, product grade, batch number, production date, proof that the product quality complies with this standard, and the number of this standard. 5.2 The user has the right to inspect the quality of caprolactam received in accordance with the inspection rules and test methods specified in this standard. The validity period is 3 months from the date of shipment.
5.3 Products of the same grade are considered to be one batch, and each batch of products shall not exceed 60t, or one batch shall be based on the output of each shift. 5.4 Sampling method:
For bagged products, determine the number of sampling bags as specified in Table 2 and take random samples. If the total number of bags is greater than 500, the number of sampling bags is calculated and determined according to 3×/N, where N is the total number of bags in each batch of products. If there are decimals, round them up to an integer. Insert the sampler into 3/4 of the bag to take samples, and the total sample volume shall not be less than 2kg. Total number of bags
1~10
11~49
50~64
65~81
82~101
102~ 125
126151
152~181
GB13254—91
Table 2
Number of sampling bags
All
11
12
13
14
15
16
17
Total number of bags
182 ~216
217~254
255~296
297~343
344~394
395~450
451512|| tt||Number of sampling bags
18
19
20
21
22
23
24|| tt||5.5 Mix the collected samples carefully, put them into two clean and dry polyethylene plastic bottles (bags), seal them tightly, attach a label, and indicate the product name, batch number, and sampling date. One bottle (bag) is for inspection, and the other bottle (bag) is sealed and stored for 3 months for future reference. 5.6 The judgment of the inspection results shall be carried out according to the rounding value comparison method in GB1250, and the rounding shall be carried out according to GB8170. 5.7 If any indicator in the inspection results does not meet the requirements of this standard, samples should be taken from twice the number of bags for re-inspection. If the results obtained still have one indicator that does not meet the requirements of this standard, the entire batch of products will be deemed unacceptable. qualified. 5.8 When the supply and demand parties have objections to product quality, the arbitration unit can be selected by both parties through negotiation, and the inspection should be carried out according to the test methods specified in this standard.
6 Marking, packaging, transportation, storage
6.1 Industrial caprolactam packaging bags should have the following marks: manufacturer name, product name, grade, batch number, net weight, trademark, production date and this label standard encdoing.
6.2 Caprolactam is packed in double-layer bags. The inner bag is a polyethylene film bag, which is heat-sealed; the outer bag is a polyethylene three-in-one bag, selected according to the regulations of GB8947, and sealed by mechanical sewing. The net weight of each bag is 25±0.25kg, and the average net weight of each bag is not less than 25kg. Or it can be packaged according to the weight required by the user, and its packaging requirements are similar to 25kg packaging.
6.3. Caprolactam should be stored in a dry and clean warehouse. Caprolactam should be protected from moisture and sunlight during transportation to prevent damage to the packaging bag.
Additional notes:
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China and is under the technical jurisdiction of the Beijing Research Institute of Chemical Industry of the Ministry of Chemical Industry. This standard is drafted by Nanjing Chemical Industry Corporation Phosphate Fertilizer Plant and Beijing Research Institute of Chemical Industry. The main drafters of this standard are Jiang Zutungsten, Ouyang Xi, and Jia Wenlan. From the date of implementation of this standard, the former Ministry of Chemical Industry Standard HG2-342-81 "Caprolactam" of the People's Republic of China is invalid. This standard refers to the Soviet national standard rOCT7850-86 "Technical Conditions for Industrial Caprolactam".
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